DF-2879 / fix_run.log
DF-2879 fix validation run — patched kernel #1 (Sep 2 20:43:17), exact same PoC $ truncate -s 266240 /tmp/swapodd && vnconfig -c vn1 /tmp/swapodd && swapctl -a /dev/vn1 swapctl: adding /dev/vn1 as swap device $ swapctl -l Device: 512-blocks Used: /dev/vbd0s1b 8388608 0 /dev/vn1 520 0 <-- REAL size now (stock kernel: 1024) $ diskinfo /dev/vn1 | head -1 /dev/vn1 blksize=512 offset=0x000000000000 size=0x000000041000 260.00 KB $ sysctl vm.swap_size vm.swap_free vm.swap_size: 1048513 <-- +1 page only (stock: +64) vm.swap_free: 1048513 $ swapctl -d /dev/vbd0s1b; /tmp/hog 5200 & # identical pressure scenario (75 s polling loop; guest stays responsive throughout) FINAL_ERROR_COUNT=0 <-- stock kernel: 25712 / 18215 + guest down dmesg delta (all of it -- correct, graceful degradation): swap low/high-water marks set to 0/0 swap_pager_getswapspace: swap full allocating 2 pages Warning: system low on memory+swap shortage 17637 for 23 ticks! Warning: system low on memory+swap shortage 18127 for 44 ticks! Warning: system low on memory+swap shortage 18127 for 65 ticks! Warning: system low on memory+swap shortage 18127 for 86 ticks! Warning: system low on memory+swap shortage 18599 for 107 ticks! Warning: system low on memory+swap shortage 18599 for 129 ticks! Warning: system low on memory+swap shortage 18767 for 150 ticks! $ pkill hog; swapctl -a /dev/vbd0s1b # full recovery, no reset needed $ swapctl -d /dev/vn1 # clean swapoff of the unaligned device $ vnconfig -u vn1 && rm /tmp/swapodd CLEANUP_OK $ vmstat (after): fre 3.24G, us 0 sy 3 id 97 -- healthy